Accession Number : AD0630863

Title :   STUDY OF SURFACE PROPERTIES OF ATOMICALLY-CLEAN METALS AND SEMICONDUCTORS. PART I. STUDY OF CDS SURFACES BY LEED. PART II. COMBINED LEED AND MASS SPECTROMETER MEASUREMENTS FOR ADSORPTION AND CATALYSIS.

Descriptive Note : Progress rept. no. 8 (Semi-annual), 1 Jul-31 Dec 65,

Corporate Author : BROWN UNIV PROVIDENCE R I

Personal Author(s) : Farnsworth,H. E. ; Campbell,B. D. ; Onchi,M.

Report Date : MAR 1966

Pagination or Media Count : 49

Abstract : A study was made of cadmium sulfide surfaces by low energy electron diffraction (LEED). The influence of illumination on the adsorption of oxygen was observed for various conditions of the surface. The photo-stimulated adsorption of oxygen was compared with the adsorption promoted by the presence of a hot filament near the sample. From the changes in potential measured during the adsorption process it was concluded that atomic oxygen is probably the adsorbate species. Combined electron diffraction and mass spectrometer measurements were applied to the adsorption of carbon monoxide on nickel. These techniques enabled the observation of surface structures as a function of the adsorbed species as well as the conditions of the surface which enhanced the adsorption of the carbon monoxide and desorption with self-oxidation to form carbon dioxide. (Author)

Descriptors :   (*SEMICONDUCTORS, SURFACE PROPERTIES), (*CATALYSTS, SURFACE PROPERTIES), (*CADMIUM, SULFIDES), (*NICKEL, ADSORPTION), METALS, ELECTRON DIFFRACTION, MASS SPECTROSCOPY, ILLUMINATION, OXYGEN, HEATING, VOLTAGE, OXIDATION, CATALYSIS

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE